package com.hzhk.happyrent.utils;

import android.graphics.Bitmap;
import android.graphics.Bitmap.Config;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.view.View;


import com.hzhk.happyrent.R;

import java.util.Random;

/**
 * 随机验证码产生和处理
 *
 * @author JKRM
 */
public class Code {
    private static final char[] CHARS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'};

    private static Code bpUtil;

    private Code () {

    }

    ;

    public static Code getInstance () {
        if (bpUtil == null) bpUtil = new Code();
        return bpUtil;
    }

    // default settings
    private static final int DEFAULT_CODE_LENGTH = 4;// 验证码的长度 这里是4位
    //	private static final int DEFAULT_FONT_SIZE = 54;// 字体大小
    private static final int DEFAULT_LINE_NUMBER = 3;// 多少条干扰线
    //	private static final int BASE_PADDING_LEFT = 12; // 左边距
    //	private static final int RANGE_PADDING_LEFT = 30;// 左边距范围值
    //	private static final int BASE_PADDING_TOP = 40;// 上边距
    //	private static final int RANGE_PADDING_TOP = 12;// 上边距范围值
    //	private static final int DEFAULT_WIDTH = 180;// 默认宽度.图片的总宽
    //	private static final int DEFAULT_HEIGHT = 60;// 默认高度.图片的总高
    private final int DEFAULT_COLOR = 0xdf;// 默认背景颜色值

    // settings decided by the layout xml
    // canvas width and height
    //	private int width = DEFAULT_WIDTH;
    //	private int height = DEFAULT_HEIGHT;

    // random word space and pading_top
    //	private int base_padding_left = BASE_PADDING_LEFT;
    //	private int range_padding_left = RANGE_PADDING_LEFT;
    //	private int base_padding_top = BASE_PADDING_TOP;
    //	private int range_padding_top = RANGE_PADDING_TOP;

    // number of chars, lines; font size
    private int codeLength = DEFAULT_CODE_LENGTH;
    private int line_number = DEFAULT_LINE_NUMBER;
    //	private int font_size = DEFAULT_FONT_SIZE;

    // variables
    private String code;// 保存生成的验证码
    private int padding_left, padding_top;
    private Random random = new Random();

    /**
     * 生成随机验证码
     *
     * @param view
     * @return
     */
    private Bitmap createBitmap (View view) {
        padding_left = 4;

        //		Bitmap bp = Bitmap.createBitmap(width, height, Config.ARGB_8888);
        Bitmap bp = Bitmap.createBitmap((int) view.getResources().getDimension(R.dimen.random_width), (int) view.getResources().getDimension(R.dimen.random_height), Config.ARGB_8888);
        Canvas c = new Canvas(bp);

        code = createCode();

        c.drawColor(Color.rgb(DEFAULT_COLOR, DEFAULT_COLOR, DEFAULT_COLOR));
        Paint paint = new Paint();
        //		paint.setTextSize(font_size);
        paint.setTextSize(view.getResources().getDimension(R.dimen.tv_random_code));

        for (int i = 0; i < code.length(); i++) {
            randomTextStyle(paint);
            randomPadding(view);
            if (i == 0 && (padding_left > 70 || padding_left < 25)) {
                padding_left = 25;
            }
            c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);
        }

        for (int i = 0; i < line_number; i++) {
            drawLine(c, paint, view);
        }

        c.save(Canvas.ALL_SAVE_FLAG);// 保存
        c.restore();//
        return bp;
    }

    public String getCode () {
        return code.toLowerCase();
    }

    public Bitmap getBitmap (View view) {
        return createBitmap(view);
    }

    /**
     * 本地生成的随机验证码实际值
     *
     * @return
     */
    private String createCode () {
        StringBuilder buffer = new StringBuilder();
        for (int i = 0; i < codeLength; i++) {
            buffer.append(CHARS[random.nextInt(CHARS.length)]);
        }
        return buffer.toString();
    }

    /**
     * 画线
     *
     * @param canvas
     * @param paint
     * @param view
     */
    private void drawLine (Canvas canvas, Paint paint, View view) {
        int color = randomColor();
        int startX = random.nextInt((int) view.getResources().getDimension(R.dimen.random_width));
        int startY = random.nextInt((int) view.getResources().getDimension(R.dimen.random_height));
        int stopX = random.nextInt((int) view.getResources().getDimension(R.dimen.random_width));
        int stopY = random.nextInt((int) view.getResources().getDimension(R.dimen.random_height));
        paint.setStrokeWidth(2);//设置线宽
        paint.setColor(color);//设置画笔颜色
        canvas.drawLine(startX, startY, stopX, stopY, paint);
    }

    private int randomColor () {
        return randomColor(1);
    }

    private int randomColor (int rate) {
        int red = random.nextInt(256) / rate;
        int green = random.nextInt(256) / rate;
        int blue = random.nextInt(256) / rate;
        return Color.rgb(red, green, blue);
    }

    private void randomTextStyle (Paint paint) {
        int color = randomColor();
        paint.setColor(color);
        paint.setFakeBoldText(random.nextBoolean()); // true为粗体，false为非粗体
        float skewX = random.nextInt(11) / 10;
        skewX = random.nextBoolean() ? skewX : -skewX;
        paint.setTextSkewX(skewX); // float类型参数，负数表示右斜，整数左斜
        // paint.setUnderlineText(true); //true为下划线，false为非下划线
        // paint.setStrikeThruText(true); //true为删除线，false为非删除线
    }

    private void randomPadding (View view) {
        padding_left += (int) view.getResources().getDimension(R.dimen.base_padding_left) + random.nextInt((int) view.getResources().getDimension(R.dimen.range_padding_left));
        if (padding_left >= 280) {
            padding_left = 280;
        }
        padding_top = (int) view.getResources().getDimension(R.dimen.base_padding_top) + random.nextInt((int) view.getResources().getDimension(R.dimen.range_padding_top));
    }

    // 把一个字符串中的大写转为小写，//小写转换为大写
    public static String exChange (String str) {
        StringBuffer sb = new StringBuffer();
        if (str != null) {
            for (int i = 0; i < str.length(); i++) {
                char c = str.charAt(i);
                if (Character.isUpperCase(c)) { // 大写转换为小写
                    sb.append(Character.toLowerCase(c));
                } else {
                    sb.append(c);
                }
                // else if(Character.isLowerCase(c)){
                // sb.append(Character.toUpperCase(c));
                // }
            }
        }

        return sb.toString();
    }
}
